<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>第68个CSS页面</title>
    <style>
        img {
            float: left;
            clear: both;
        }
    </style>
</head>
<body>

<img src="http://www.w3school.com.cn/i/eg_smile.gif" alt="No picture"/>
<img src="http://www.w3school.com.cn/i/eg_smile.gif" alt="No picture"/>
</body>
</html>